Telegraph system.



I. KITSEE.

TELEGRAPH SYSTEM. APPLICATION FILED M311,

Patented Mar. 3, 1914.

WIINESSES g??? claims.

nrr nn s'ra'rns PATENT OFFICE.

ISIDOR KITSEE, OF PHILADELPHIA, PENNSYLVANIA, .ASSIGNOR T0 AMERICAN TELEPHONE AND TELEGRAPH COMEANY, OF NEW YORK, N. Y., A CORPORATION O'E NEW YORK.

TELEGRAPH SYSTEM.

Specification of Letters Patent.

rammed Mar. 3,1914.

To all 'zl'hom tam/1 concern Be it known that .l, Isrnon Ki'rsnn, a citizen oi the United States, residing at Philadelphia, county of Philadelphia, State of Tennsylvania, have invented certain new and useful Improvements in Telegraph Systems, of which the'following is a specification.

My invention relates to telcgrapl'iy and more particularly to telegraphy over long lines or cables, such as subterranean or sub marine cables, or any conductor, especially when having relatively great capacity.

My invention resides in a telegraph system in which current impulses are transinitted'o'vcr the line or cable, impulses one. polarity representing dots, while impulses oi the other polarity represent dashes, together with receiving apparatus including a sensitive relay associated with the line or cable which controls a local circuit including polarized relays, and a soundcr, recorder, or relay, such, for exam plc, as may be employed. to control a telegraphic printing apparatus, is controlled by such polarized relays, one of such relays responding to cur rent representing a dot, ,while the other rcsponds to a current representing a clash, the latter in so doing causing a relatively longer control of the local circuit including the sounder, recorder, or relay.

My invention resides in other matters hereinafter described and pointed out in the For my invention may take,

drawing, which is a diagrammatic illustration of circuits and apparatus.

In the drawing, C represents a submarine or subterranean cable, or other line or cable having great capacity, though it is to be understood that my invention may also be used with lines or cables in general. Between the receiving end of the cable (.3 and tho earthE is connected the primary P of a transformer whose secondary is S. This transformer may be of any suitable type; or may be either a step-up or step-down transformer or may have either an open or closed magnetic circuit. One terminal of the secondary S connects by conductor 1 with one terminal of the Winding of the polarized an illustration oi one of the forms and very sensitive relay R Such relay It may be of a type similar to that described in my Patent No. 963,374, though it is to be understood that my invention is applicable with any other suitable type of relay. The other terminal of the winding of the relay R connects by conductor 2 with the other terminal of the secondary S.

The tongue 30f the relay R is biased, by siutablo sensitive springs 4, 4, to a normal position between the relay contacts 5 and 6 to which are connected terminals ofthc.

split battery comprising the parts or halves 7) and 7) communication with the tongue 3 andwith one terminal of the winding of the polarized relay R whose other terminal connects with one terminal of the winding of the polarized relay R the other terminal of the winding connecting by conductor 8 to a point between the batteries or sources I) and (2 The tongue 9 of the polarized relay R is biased by a spring to the normalposilion shown against the stop 10. And the The conductor 7 is in electricaltongue 11 of the polarizedrelay R is biased by a spring to the normal position shown in engagement with the stop 12. The tongue 11 has a hooked end 13 which, when the relay R tain polarity, is moved into engagement with the stop 14-. Before the hook end 13 engages stop 14, theeontact 15 engages contact 16 and they remain in contact due to the yielding of the'spring 17 until, on

the return movement. the hook end 13 again engages the spring 17 to separate the contacts 15 and 16. The relay tongues 9 and 11 are electrically connected by conductor 18 and are included in circuit with the battery or source b with the winding of the magnet n of a sounder, recorder, or relay,

which relay may control a printing telegraph apparatus or any other suitable apparatus. The armature 19 is normally spring retracted against the stop or contact 20, and when the magnet a is energized, is attracted so that the armature lever engages the stop or contact 21. The other terminal of the winding. of the magnet-n connects with the contact 16 of relay R and with contact- 22 of the relay R The operation is as follows: The operator at the distant station transmits to line is energized by current of a ceror cable current impulses of one polarity to represent dots, and impulses of the opposite polarity to represent dashes. The arriving impulse, say, a positive impulse representing a dot, traverses the primary P and by induction causes a momentary current in the secondary S which current traverses the winding of the sensitive relay R The first part of an impulse arriving over a cable or line having great capacity increases in strength more' rapidly than the last portion of the impulse-diminishes. In other words, the

front of the arriving wave is relatively steep causing a substantial current induced in the secondary S, while the dying away of the impulse is so slow that, while theoretically there is some current induced in the second ary S, it is not suflicient' to actuate the relay R This eil'ective secondary current will cause tongue 3 of relay R to engage, for example, the contact 5, but immediately return .to its normal position shown. This .means that a current passes in a certain direction from the-source 6 through the circuit including the conductors 7 and 8, and the windings of the two polarized relays R and'R The relay R only responds to this current, being of a given polarity, and its tongue 9 momentarily engages the contact 22, thus energizing the magnet n to cause a movement ,of its armature 19 to obi-respond with the movement of a sounder, or recorder magnet to produce a dot. Or,if a is a relay,

it makes momentary closure or opening of a controlled circuit. If, however, a negative impulse is received, the current induced in the secondary S is of opposite direction, and the tongue 3 momentarily engages the con- .tact 6 and then immediately'returns to the normal position shown. This means that a current of opposite polarity will now-flow for a short time through the circuit including the windings of-the polarized relays R r and R The current being of opposite direction, however, the rela spond but the relay R will respond. This means, as heretofore described, a relatively protracted contact between 15 and 16,- thus energizing the magnet 12, a relatively longer time to reproduce a dash, or if a relay, to cause a prolonged opening or closure or the controlled circuit for printing or other purposes. It is apparenu therefore, tha't by transmitting over the line or cable short impulses, impulses of one polarity for'dots and impulses of the other polarity for dashes, I am enabled by my system and apparatus to cause a rcpraductiou by a sounder or recorder of dots and dashes, or to control another circuit in such manner that currents of different durntionsrnay ilow therein.

What I claim is:

.L'The combination with a line or cable carrying impulscs'ot' one polarity torepresent dots and of opposite polarity to. repre- R will not re sent dashes, of a sensitive relay associated with said line or cable, a local circuit controlled by said relay and including a plurality of polarized relays, one relay in said local circuit serving to reproduce dots, and ancontact to reproduce dashes.

- 2.1 The combination with a line or cable carrying current impulses of one polarity representing dots and of theother polarity representing dashes, of a relay associated therewith, a local circuit including a plurality of polarized relays controlled by said re.-

lay, means'for causing currem flow in said local circuit 1n' one direction in response to a line or cable impulse of one polarity, and

" for causin a current flow in opposite direction in sai local circuit in response to a line or cable impulse of opposite polarity, said relays in said local circuit making contacts of different durations.

3. The combination with a line or cable carrying current impulses of one polarity representing dots and of the other polarity re resentin dashes ofa sensitive 'rela as-- sociated therewith, a local circuit including a plurality of polarized. relays controlled bysaid sensitive relay, means for causing current flow in said local circuit in'one direction in response to a line or cable impulse of one polarity and for causing current flow in opposite. direction in said local circuit in response to a line or cable impulse of opposite polarity, one of said relays in said local. circuit responding to a current of one. direction to reproduce dots, and another relay in said local circuit responding to current of opposite direction and making protracted contact to reproduce dashes. I

4. The combination with a line or cable carrying current impulses of one polarity other relay in said circuit making protracted representing dots and current impulses of I 5. The combination with a line orcable' carrying impulees'of one polarity to-represent dots and of oppositepolarity to represent dashes, of a sensitive relay associated with said line or cable and co iprismg amovable contact movable a fixed istance be tween stationary contacts, a transformer intervening between said relay and said line or cable, a local circuit controlled-by said relay and including a plurality of relays, a second local circuitcontrolle'd by said relays, one relay'in said local circuiucontrolling said second local circuit to reproduce dots, and another relay protractedly controllingsaid second local circuit to reproduce dashes.

6; The combination with a line or cable carrying current impulses of one polarity representing dots and of the other polaritylays, means for causing current flow in said first local circuit in one direction in response to a line or cable impulse of one polarity, and for causing a current flow in opposite direction in said first local circuit in response to a line or cable impulse of opposite polarity, one of said relays protractedly controlling said second local circuit.

7. The combination with a line or cable carrying current impulses of one polarity representing dots and of the other polarity representing dashes, of a sensitive relay as-- sociated therewith and comprising a movable contact movable a fixed distance between stationary contacts, a local circuit includinga plurality of relays controlled by said sensitive relay, means for causing current flow in said local circuit in one direction in response to a line or cable impulse of one polarity and for causing current flow in opposite direction in said localcircuit inrespouse boar line or cable impulse of opposite polarity, a second local circuit, one of said relays in said local circuit respondingto a current of one direction to cause a current of short duration in said second local circuit, and another relay protractedly controlling said second localcircuit responding to current of opposite-direction to cause current of longer duration in said second local circuit.

8. The COITIblIlZIlLlOILWlth a line or cable carrying current impulses ofone polarity rem-esenting dots and current impulses o opposite polarity representing dashes, of a sensitive relay, a transformerintervening between said relay and said line or cable, a local circuit controlled thereby and including a plurality of polarized relays, a second local circuit controlled by said polarized relays, one ,of said polarized relays responding to current of one direction for'momentarily controlling the second local circuit,

ainlanother of said polarized relays responsive to current of opposite direction for protractedly controlling said second local, circuit,

9. The combination with a line or cable carrying impulses of opposite polarityand of substantially equal duration, of a relay associated with said line or cable, a local circuit controlled by said relay, a plurality of relays in said locat circuit, a second local circuit controlled by said relays, a. signal reproducing instrument in said second local circuit, one of said relays in saiddocal circuit being polarized and controlling said second local circuit for a time'longer than the control exercised by anotherof said relays in said local circuit:

10, The combination with a line or cable carrying impulses of one polarity representing dots and of another polarity representing dashes, of a sensitive relay associated therewith, a local circuit controlled by said relay, relays controlled by said local circuit, a second local circuit, the contacts of said relays connected in parallel with each other in said second local circuit, a sounder in said second local circuit, and means associated with a relay in said local circuit for protractedly controlling said second local.circuit.

11. The combination with a line or cable.

carrying current impulses of one polarity representing dots and of the other polarity,

representing dashes, of a relay associated therewith, a local circuit controlled by said relay, said local circuit traversed by current in opposite directions in response to line or cable impulses of opposite directions, polarized relays controlled by said local circuit, a second local circuit controlled by said polarized relays, one of said polarized relays protractedly controlling said second local circuit. r

12.- The combination with a line or cable carrying current impulses of one polarity representing dots and current impulses of opposite polarity representing dashes, of a sensitive relay, a transformer intervening between said relay and said line or cable, a conductive connection from. said line or vcable to earth through a winding of said transformer, a local circuit controlled by said sensitive relay and including a plurality of polarized relays, a second local circuit controlled by said polarized relays, one of said relays responding to current of one direction for momentarily controlling the second local circuit, and another of said polarized relays responsive to current of opposite direction for protractedly controh ling said second local circuit.

13. The combination with a line or cable, of a sensitive relay associated therewith, a local circuit controlled by said relay and including a plurality of polarized relays, one of said relays making short contact and another of said relays making protracted contact.

14. The combination with a line or cable, of a sensitive relay associated therewith at the receiving end thereof, a local circuit controlled hy said relay and including a plurality of relays, one of said relays making short contact and another of said relays making protracted contact, and a single fixed my signature in the presence of the local circuit controlled by said-relays in said two subscribing Witnesses. local. circuit, the contacts of said relays in r i said local circuit, connected in parallel With o I 5 'respect to each other in said second local cir-c \Vitnesses:

cuit. v ELEANOR T. MGCALL,

Intestimony. whereof I have hereunto af- A. STE NBOCK.

Copies of this patent may be obtained for five cents each, by addreaain Washington, D. C.

g the Commissioner of mm a 

